5 maintenance records every car owner should keep (and why)

Five records cover almost everything a car owner is ever asked for: the service history, a fuel log, tyre and brake dates, a list of repairs and parts, and the vehicle's paperwork. Kept properly, they settle warranty disputes, catch a garage that has quietly become expensive, tell you when the car is costing more than it is worth, and add real money at resale. Here is what each one is, why it matters and the minimum worth writing down.

1. The service history

What: every scheduled service with the date, odometer reading, garage, items done and the cost.

Why: it is the single document that most affects what your car is worth. A used-car buyer who sees a dated list of oil changes at the right intervals stops negotiating on condition. One who sees nothing assumes the worst and prices accordingly. It also settles warranty claims: manufacturers can refuse a claim if you cannot show the car was serviced on schedule, and "I think it was done in March" is not evidence.

Minimum entry: date, km, garage, "general service" or the list of items, total. Thirty seconds.

2. The fuel log

What: every fill-up with date, odometer, litres and price.

Why: three reasons. It gives you your real fuel economy, which is the earliest warning you get of a mechanical problem (a slow fall in km/L precedes most expensive faults). It gives you your actual fuel spend rather than a guess. And the odometer readings become a timeline that dates every other record.

Minimum entry: the four fields above. Scanning the receipt gets them in one go.

3. Tyre and brake dates

What: when each set of tyres and each set of brake pads or discs was fitted, at what odometer reading, and the brand or part number.

Why: tyres and brakes are the two wear items that fail expensively and dangerously if ignored, and both have mileage lives you can plan around (tyres 40,000 to 60,000 km; pads 30,000 to 70,000 km depending on driving). Knowing the fitting date tells you when to start checking, and when a quote for "new pads" is suspicious because the last set is 12,000 km old.

Minimum entry: a service-log line per fitting. Note tyre pressure you run, too; it changes fuel economy more than most people believe.

4. Repairs and replaced parts

What: anything outside scheduled servicing: battery, clutch, alternator, air-conditioning compressor, suspension parts, bodywork.

Why: two of these in a year is a car telling you something. Many parts come with their own warranty (batteries typically two to three years), and you cannot claim without the date. And a buyer who hears "the clutch was done at 62,000 km" trusts the rest of the story.

Minimum entry: date, km, part, cost, where. Keep the original invoice for anything with a warranty.

5. The paperwork

What: registration, insurance policy and renewal date, inspection or pollution certificate and its expiry, loan documents, and the original purchase invoice.

Why: a lapsed insurance or pollution certificate is a fine at the next check and a real problem after an accident. The purchase invoice is what you need for an insurance total-loss claim and for calculating depreciation. None of it is hard to keep; all of it is hard to find the day you need it.

Minimum: a photo of each document and the renewal dates somewhere that reminds you.

How long to keep them

• Service and repair records: for as long as you own the car, then hand them to the buyer. That handover is the point.
• Fuel log: indefinitely; it is small and the trend is the value.
• Parts invoices: until the part's warranty expires, at least.
• Purchase invoice and loan papers: until the car is sold and the loan closed.

Where to keep them

The test is simple: can you produce the record in under a minute, from your phone, at the garage or in front of a buyer? A shoebox fails. A spreadsheet passes if it is in cloud storage and you actually open it at the pump. A dedicated app passes by design, provided it syncs so the records survive a new phone. Spreadsheet or app is a fair question; the answer is whichever one you will actually keep up.

The habit that makes it work

Log at the moment of the expense. At the pump, before you pull away. At the garage, while the invoice is in your hand. A record kept later is a record kept wrongly or not at all, which is how five years of ownership turns into a vague memory and a lower sale price.